femto-
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femto-
Where it comes from
From Danish femten (“fifteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains atto-.
prefix
-
In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁵ (short scale quadrillionth or long scale billiardth).
Opposite: peta-
Translations
Talk about this word "femto-." Wiktionary, via Micwyn, micwyn.com/word/femto-. Accessed 6 Nov. 2026. femto-. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/femto- "femto-." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/femto-.Cite this
@misc{femto_2026,
title = {femto-},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/femto-},
urldate = {2026-11-06}
}
